64 Proceedings of Royal Society of Edinlurgh. [sess. 
formula when all the vertebrae are ossified, and due care is taken 
for their preservation. The epiphysial plates were fused with the 
bodies of their vertebrae in the Granton specimen, but in the lumbar 
and dorsal regions evidence of their original separation c.ould still 
he seen. 
The skeleton of the young rostrata from Queensferry dissected by 
the brothers Knox, which is now in the Anatomical Museum of the 
University, and which is preserved as a natural skeleton, had the 
formula C^Djj. Twelve lumbar •vertebrae intervened between the 
last rib-bearing dorsal and the vertebra to the posterior border of the 
body of which the 1st chevron bone was articulated. Kine caudal 
vertebrae carried chevron bones, h,nd behind the last of the^e ten 
osseous or cartilaginous nodules represented the terminal vertebrae of 
the tail : the entire formula is 
The 1st, 4th, and 7th cervical vertelrce in the Granton specimen 
were separate bones. The axis and 3rd cervical were partially fused 
by their bodies, laminae, and spines. The 5th and 6th were fused 
at the tips of the inferior transverse processes, but elsewhere they 
were quite distinct. In the adult Dunbar specimen all the cervicals 
were separate bones except the axis and 3rd cervical, the bodies of 
which were fused together. In the young animal caught at Alloa, 
the axis and 3rd cervical were fused at their spines. It is obvious, 
therefore, that in B. rostrata there is a tendency to fusion between 
the 2nd and 3rd cervicals. In none of the specimens had the atlas 
a foramen in its transverse process. In the Granton and Dunbar 
animals each lamina was perforated by a foramen dorsad to the con- 
dylar articular surface for the 1st cervical nerve ; but in the Alloa 
specimen the hole was represented by a deep groove. The height 
of the atlas in the Granton and Dunbar specimens was 8 and 8^ 
inches, and in that from Alloa 6 inches. The breadth between 
the tips of the transverse processes was 13|, 13|-, and 8 inches 
respectively. The axis was as usual the largest vertebra of the 
neck, its height in the Granton and Dunbar specimens was 8|- inches, 
in that from Alloa 6 inches; the greatest transverse diameter in 
* The brothers Knox in their account of this animal give the vertebrae as 
follows, C 7 DiiLCd 3 o = 48 ; but from the appearance of the tail in the dried 
skeleton it seems as if an additional cartilaginous nodule were present in the 
caudal series. 
